From nobody Thu Feb 2 15:45:38 2023 X-Original-To: hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4P73666sMQz3fmtm for ; Thu, 2 Feb 2023 15:45:50 +0000 (UTC) (envelope-from jbo@insane.engineer) Received: from mail-4323.proton.ch (mail-4323.proton.ch [185.70.43.23]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "protonmail.com", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4P73646W8Nz3MCG for ; Thu, 2 Feb 2023 15:45:48 +0000 (UTC) (envelope-from jbo@insane.engineer) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=insane.engineer header.s=protonmail3 header.b=nv3G1LpN; spf=pass (mx1.freebsd.org: domain of jbo@insane.engineer designates 185.70.43.23 as permitted sender) smtp.mailfrom=jbo@insane.engineer; dmarc=pass (policy=none) header.from=insane.engineer Date: Thu, 02 Feb 2023 15:45:38 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=insane.engineer; s=protonmail3; t=1675352746; x=1675611946; bh=4bcXwElOg8iv3S5lRZPuWnMFqoUgZnHca23VMVc3ZWc=; h=Date:To:From:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=nv3G1LpNqfNM5TPwc5P/MbR6r3NZzQNkzkKFd45t0gATpftdw8LR5EUlUGCMq3sJ3 2KU6uaFKRl67Nk215mb9Vns/BbRUl0/maLXUCGvy84Gx97bCfoWnaUOguJDluXLSE4 NSpp3GSkr4kvWCE2AgLAWpkPZNS0eeQy0oD06L2iJqOhJkHt9xLpUF8r9+2IFvj1qA oBnABzjzEkY9zVXI3d8a1qkOIXEkNJPOkATTqnqbAw4ChpUdwGwl+syjQw7RPNYYKL BLsHbegqlf+vKqk6biGAMRmn/v4+Rd3yVsoGGmZha6gB9mYgp2qE6V61/pIoT4HBOT 2RzHc4ok/ooyg== To: "hackers@freebsd.org" From: jbo@insane.engineer Subject: Re: Swap, ZFS & ARC Message-ID: In-Reply-To: <1689ba8c-a317-ce1f-2854-99566468a9ed@grosbein.net> References: <1689ba8c-a317-ce1f-2854-99566468a9ed@grosbein.net> Feedback-ID: 40997969:user:proton List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-4.00 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; DMARC_POLICY_ALLOW(-0.50)[insane.engineer,none]; R_SPF_ALLOW(-0.20)[+ip4:185.70.43.0/24]; R_DKIM_ALLOW(-0.20)[insane.engineer:s=protonmail3]; MIME_GOOD(-0.10)[text/plain]; MLMMJ_DEST(0.00)[hackers@freebsd.org]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:62371, ipnet:185.70.43.0/24, country:CH]; TO_DN_EQ_ADDR_ALL(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_NO_DN(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; DKIM_TRACE(0.00)[insane.engineer:+]; RWL_MAILSPIKE_POSSIBLE(0.00)[185.70.43.23:from] X-Rspamd-Queue-Id: 4P73646W8Nz3MCG X-Spamd-Bar: --- X-ThisMailContainsUnwantedMimeParts: N ------- Original Message ------- On Thursday, February 2nd, 2023 at 14:41, Eugene Grosbein wrote: >=20 >=20 > 02.02.2023 21:28, jbo@insane.engineer wrote: >=20 > > Hello folks, > >=20 > > Based on a discussion on the forums not so long ago I tried to figure o= ut how swap usage on a ZFS system plays together with ARC. However, I could= find very little to no information on this which leads me to believe that = there is some "core concept" I might be oblivious to. > >=20 > > The main question is basically this: Your system starts to swap out dat= a from RAM to your swap partition. > > This swap data on disk ultimately resides somewhere in a ZFS pool. >=20 >=20 > I prefer not doing this. That is, all my systems have swap partition outs= ide of ZFS pool. This isn't really achievable on your average "single disk" desktop systems,= right? Assuming I'm not missing something (which is why I came here to ask), a "re= gular" or "default" installation through the FreeBSD installer would setup = a swap partition within the zpool, right?